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Tipsheet for the May issue of the American Naturalist
Date:4/26/2011

ion in the Australian Giant Cuttlefish, Sepia apama"

Genes control fruit flies' social groupings

A new study reveals how a fruit fly's genes can influence the company it keeps. Using male flies that had been bred for varying levels of aggressiveness, researchers Julia Saltz and Brad Foley observed how the males formed groups when placed into an enclosure with females. The research showed that the non-aggressive flies clumped together, forming a few large groups. The aggressive flies, meanwhile, spread out into smaller groups. This sorting according to behavioral preference is known as social niche construction (SNC), and Saltz says this is the first time it has been demonstrated to have a genetic basis. In sorting themselves this way, both aggressive and non-aggressive flies were able to find mating success. Some flies were more likely to mate after winning an aggressive conflict. Those flies benefitted from being aggressive. Other flies however were more likely to mate after losing a squabble. Those flies benefitted from forgoing aggression. "Thus, successful males were those who 'used' SNC to generate the social environment in which they are most adept at mating," explains Saltz, a Ph.D. student and lead author on the paper. "Non-aggressive genotypes aren't just 'broken' males. They're pursuing an alternate social strategy."

Julia B. Saltz (University of Southern California and University of California, Davis) and Brad R. Foley (University of Southern California), "Natural Genetic Variation in Social Niche Construction: Social Effects of Aggression Drive Disruptive Sexual Selection in Drosophila melanogaster"

What can twins tell us about mate choice?

What factors influence our choice of a mate? Is it our genes? Does a man look for someone like his mother and a woman someone her father? None of the above, according to a study of Australian twins. Researchers from the University of Queensland fo
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Contact: Kevin Stacey
kstacey@press.uchicago.edu
773-834-0386
University of Chicago Press Journals
Source:Eurekalert

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